My best friend's gal mom is way too much of an angel

Description: My name is Junpei. I grew up in a single-father household from a young age. This is the apartment where I live with my dad. An angel lives next door. 'Sanada Marie'-san. She is the mother of my best friend and classmate 'Sanada Rintaro'. Long blonde hair and an outstandingly erotic body. Kind... and the cutest. A visual that does not look like a parent with a child. After school I always go to my best friend's house, talk with the angel-like Marie-san, and touch her charm as part of my daily life. 'I see, I see. That must have been hard.' 'Jun-chan, you worked hard, you're amazing.' She always says those words to me and stays close. She dotes on me, who has no mother, as if I were her real son. One day I end up witnessing the beloved Marie-san changing clothes... The naked body of Marie-san visible from the hallway... it is a shocking sight. Large yet firm breasts, a tightly cinched waist, long legs, nipples of a beautiful color.... I could not hold back my excitement from her too-erotic body. I reach for my own cock and start stroking it right there, forgetting myself... 'I... I'm cumming...!' But...!!! The scene of my ejaculation is witnessed by Marie-san...!!! 'Eh... Ju-Jun-chan...?' It's over...! Everything...! Or so I thought...! But Marie-san's reaction is unexpected...?! '...You have a girl you like right now, right? Then... you should practice.' 'Practice for... sex...' 'This is an absolute secret from my son, okay...?'